Butter straw



FIG. 1 is a reduced perspective view showing my new design for a butter straw;

FIG. 2 is a right side elevational view thereof, the left side being a mirror image thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a top elevational view thereof; and,

FIG. 6 is a bottom elevational view thereof.

The broken lines showing other matter in FIG. 1 are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a butter straw, as shown and described. 